Node-js-notebook

Node.js is a JavaScript runtime built on the V8 JavaScript engine. It allows you to run JavaScript code on the server side.

Contents

• Nodejs Modules

  • http
  • path
  • event
  • process
  • file system
  • child-processes
  • stream
  • cluster
  • worker-threads
  • operating system
  • crypto
  • buffer
  • zlib

• Advanced

  • Build video streaming api
  • Register and login with password encryption
  • DB sharding

Installing Node.js

• Visit the Node.js official website to download and install Node.js on your machine.

Creating Your First Node.js File

• Open a text editor and create a file named app.js.

• Add the following code to print "Hello, Node.js!" to the console:

  console.log("Hello, Node.js!");

Running Your Node.js File

• Open a terminal and navigate to the directory containing app.js.

• Run the following command to execute your Node.js script:

  node app.js

• You should see the output: "Hello, Node.js!".

Node Package Manager (npm)

• npm is the package manager for Node.js. It allows you to install and manage packages (libraries) for your Node.js projects.

• Check the installed npm version:

  npm -v

• Initialize a new package.json file for your project:

  npm init

  Follow the prompts to configure your package.

Before going to individual module, let me tell you, about the node js basic GET API

Creating a Simple HTTP Server

• Create a new file named server.js.
• Add the following code to create a basic HTTP server:

This is a most basic GET API, which we will use in almost all of the modules to describe their functionality.

// # import default `http` module from node.js
const http = require("node:http");

// # create a server instance, which is listing port 3000.
http
  .createServer((req, res) => {
    // # Creating response header with 200 status code.
    res.writeHead(200, { "Content-Type": "text" });
    // # Sent this string as API response
    res.end("Basic GET API");
  })
  .listen(3000, () => {
    // # Listing port 3000
    console.log(`Listening port 3000`);
  });

// # You can check this API on your browser 3000 port.